Hysteretic power converter with switch gate current sense

摘要

A driver circuit for a switched-mode power converter is configured to perform hysteretic control of a switched-mode power converter. The switched-mode power converter comprises an inductor configured to store energy during a first state of the switch and to release energy towards a load of the switched-mode power converter during a second state of the switch. The driver circuit comprises a filter unit which is configured to determine a command signal based on a gate control signal applied to a gate of the switch. The command signal is indicative of a current through the inductor. The driver circuit comprises hysteretic control circuitry configured to generate the gate control signal based on the command signal; wherein the switch alternates between the first and second state when being subjected to the gate control signal.

主权项

1. A driver circuit configured to control a switch of a switched-mode power converter; wherein the switched mode power converter comprises an inductor configured to store energy during a first state of the switch and configured to release energy towards a load of the switched mode power converter during a second state of the switch; wherein the driver circuit comprises:
a filter unit which is configured to determine a command signal based on a gate control signal applied to a gate of the switch, wherein the command signal is indicative of a current through the inductor; wherein the filter unit comprises a low pass filter for filtering the gate control signal to determine a low pass filtered signal from the gate control signal; wherein the filter unit comprises a high pass filter configured to remove a DC component from the low pass filtered signal, thereby yielding an AC signal; wherein the command signal is derived from the AC signal; and hysteretic control circuitry configured to generate the gate control signal based on the command signal, wherein the switch alternates between the first and second state when being subjected to the gate control signal.